Update json requirements to work with a Rails 5 project

- Locking the json to an old version seems uneccessary
- Forcing multi_json and json_pure monkeypatching broke our test suite
- removed the json_pure and so far so good

Author: radixhound

Rakefile

@@ -1,5 +1,5 @@
-# frozen_string_literal: true
 # encoding: UTF-8
+# frozen_string_literal: true
 
 require 'bundler/gem_tasks'
 require 'rubocop/rake_task'

lib/mockserver-client.rb

@@ -4,17 +4,3 @@
 require_relative './mockserver/version'
 require_relative './mockserver/mock_server_client'
 require_relative './mockserver/proxy_client'
-
-# Setup serialization correctly with multi_json
-require 'json/pure'
-
-# To fix serialization bugs. See: http://prettystatemachine.blogspot.com/2010/09/typeerrors-in-tojson-make-me-briefly.html
-# rubocop:disable Lint/UnifiedInteger
-class Fixnum
-  def to_json(_)
-    to_s
-  end
-end
-
-require 'multi_json'
-MultiJson.use(:json_pure)

mockserver-client.gemspec

@@ -31,10 +31,7 @@ Gem::Specification.new do |spec| # rubocop:disable Metrics/BlockLength
   spec.add_dependency 'activesupport', '>= 4.1'
   spec.add_dependency 'colorize', '~> 0.7'
   spec.add_dependency 'hashie', '~> 3.0'
-  spec.add_dependency 'json', '~> 1.8'
-  spec.add_dependency 'json_pure', '~> 1.8'
-  spec.add_dependency 'activesupport', '~> 4.1'
-  spec.add_dependency 'rest-client'
+  spec.add_dependency 'json', '>= 1.8'
   spec.add_dependency 'logging_factory', '~> 0.0.2'
   spec.add_dependency 'rest-client', '>= 1.7'
   spec.add_dependency 'thor', '~> 0.19'